The BGS Lexicon of Named Rock Units — Result Details

Keristal Member

Computer Code: KERI Preferred Map Code: notEntered
Status Code: Full
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: A thick-bedded quartz-arenite sandstone.
Definition of Lower Boundary: Stratigraphical with undivided Lonan Formation, marked by change from a sandstone-dominated facies to a mudstone-dominated facies (in the Lonan).
Definition of Upper Boundary: Stratigraphical with undivided Lonan Formation or Santon Member.
Thickness: From 5 m to 10 m thick.
Geographical Limits: Isle of Man.
Parent Unit: Lonan Formation (LNN)
Previous Name(s): Lonan And Niarbyl Flags (-2206)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  The west side of Keristal Bay. Woodcock et al., 1999. 
Reference(s):
Geological Survey. 1898. Isle of Man. Sheet 36,45,46 and 57. Solid and Drift geology. 1:63 360 scale. Reprinted at 1:50 000 scale by Institute of Geological Sciences 1975 (Southampton: Ordnance Survey). 
Lamplugh G W. 1903. The geology of the Isle of Man. Memoir Geological Survey of Great Britain 
Woodcock N H, Morris J H, Quirk D G, Barnes R P, Burnett D, Fitches W R, Kennan P S and Power G M. 1999. Revised lithostratigraphy of the Manx Group, Isle of Man. 45-68 in 'In sight of the suture' the Palaeozoic geology of the Isle of Man in its lapetus Ocean context. Woodcock N H, Fitches W R, Quirk D G and Barnes R P [editors]. Geological Society of London, Special Publication No. 160. 
Simpson A. 1963. The stratigraphy and tectonics of the Manx Slate Series. Quarterly Journal of the Geological Society of London, Vol. 119, 367-400 
Chadwick, R A, Jackson, D I, Barnes, R P, Kimbell, G S, Johnson, H, Chiverell, R C, Thomas, G S P, Jones, N S, Riley, N J, Pickett, E A, Young, B, Holliday, D W, Ball, D F, Molyneux, S G, Long, D, Power, G M and Roberts, D H. 2001. Geology of the Isle of Man and its offshore area. British Geological Survey Research Report, RR/01/06. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E400